Abstract
This study evaluated the chlorine dioxide (ClO2) gas mediated inactivation of the biofilm cells of foodborne pathogens on food contact surfaces. Biofilm cells of Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes were developed on stainless steel (SS) and high density polyethylene (HDPE) coupon surfaces, and 5-day-old biofilms were treated with ClO2 gas at 60 and 90% relative humidity (RH) for up to 20 min. With an increase in gas concentration and treatment time, significant differences (p < 0.05) were observed between reduction levels under different RH conditions. Treatment with 50 ppmv of ClO2 gas (60% RH) for 20 min resulted in log reductions from 2.08 to 4.62 and 2.08 to 4.41 of the biofilm cells of three pathogens on SS and HDPE surfaces, respectively. The levels of biofilm cells of E. coli O157:H7, S. Typhimurium, and L. monocytogenes on SS and HDPE surfaces were reduced to below the detection limit (0.48 log CFU/cm2) within 15, 20, and 20 min, respectively, when exposure to 50 ppmv of ClO2 gas at 90% RH.
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Abbreviations
- SS:
-
Stainless steel
- HDPE:
-
High density polyethylene
- RH:
-
Relative humidity
- EPS:
-
Extra polymeric substances
- TSA:
-
Tryptic soy agar
- TSB:
-
Tryptic soy broth
- PBS:
-
Phosphate-buffered saline
- PW:
-
Peptone water
- SMAC:
-
Sorbitol MacConkey agar
- XLD:
-
Xylose Lysine Desoxycholate agar
- OAB:
-
Oxford agar base
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Acknowledgements
All bacterial strains used in this study were kindly provided by Dong-Hyun Kang (Department of Food Science and Biotechnology at Seoul National University). This research was financed by the National Research Foundation of Korea (NRF) and Korea Forest Service.
Funding
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government(MSIT) (NRF-2020R1F1A1048617). This study was carried out with the support of 'R&D Program for Forest Science Technology (Project No. 2021332C10-2123A01)' provided by Korea Forest Service (Korea Forestry Promotion Institute).
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All authors contributed to this manuscript as; S-YK: Investigation, Writing—original draft. S-HP: Conceptualization, Writing—review & editing, Resources, Supervision, Funding acquisition.
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Kim, S., Park, S. Chlorine dioxide gas mediated inactivation of the biofilm cells of. J Food Sci Technol 59, 4863–4869 (2022). https://doi.org/10.1007/s13197-022-05574-2
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DOI: https://doi.org/10.1007/s13197-022-05574-2